/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Selections/GeometrySelection.h
(Currently there is no way to swap the order)
struct FGeometrySelectionDelta
TArray< uint64 ...
Added
Elements added to aFGeometrySelectionduring some selection edit
TArray< uint64 ...
Removed
Elements removed from aFGeometrySelectionduring some selection edit